Mariano Eduardo de Rivero y Ustáriz (1798–1857) was a Peruvian scientist, geologist, mineralogist, chemist, archaeologist, politician, and diplomat. After schooling in Arequipa, he was sent in 1810 at age 12 to London to study mathematics, physics, and languages. In 1817 he traveled to France to the École royale des mines de Paristo study mineralogy and chemistry. In France he met Joseph Louis Proust, Gay-Lussac, and Alexander von Humboldt. The latter became his mentor and, during the course of his travels in Europe, Rivero discovered a new iron-oxalate that ...